Question Electrical buzzing/dimmer light switch/grasshopper sound from RM650i PSU

Feb 17, 2019
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Hi, I've noticed that my power supply has been making an electrical buzzing sound which almost sounds like a dimmer light switch buzzing or the noise grasshoppers make, I doubt its the coil whine sound as it sounds more like electric flowing instead of the vibrating sound of coil whine.

Can anyone guess whats going on or how serious it is?

And I don't know how long its been going on for I've only noticed.
 
Feb 17, 2019
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The thing is the sound is only heard when I'm right close to the psu (just about hear it 30cm away max). I can't hear it any other distance. And the computer been working fine all this time.
 
Feb 17, 2019
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So that's the usual sound it makes when you're up close to a power supply. Is it the transistors that make that sound? I was just being super paranoid?
 

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